Delete pdfium fetch recipe
Delete pdfium fetch recipe

It's incorrect - the checkout it creates is unusable for pdfium
development.

Correct instructions are here:
https://code.google.com/p/pdfium/wiki/Build

BUG=510419
R=phajdan.jr@chromium.org

Review URL: https://codereview.chromium.org/1382543002

git-svn-id: fd409f4bdeea2bb50a5d34bb4d4bfc2046a5a3dd@296946 0039d316-1c4b-4281-b951-d872f2087c98

aleonliao/depot_tools,CoherentLabs/depot_tools,hsharsha/depot_tools,primiano/depot_tools,duongbaoduy/gtools,hsharsha/depot_tools,primiano/depot_tools,primiano/depot_tools,disigma/depot_tools,duongbaoduy/gtools,azureplus/chromium_depot_tools,duongbaoduy/gtools,Midrya/chromium,azureplus/chromium_depot_tools,Midrya/chromium,disigma/depot_tools,hsharsha/depot_tools,duanwujie/depot_tools,duanwujie/depot_tools,aleonliao/depot_tools,disigma/depot_tools,Midrya/chromium,azureplus/chromium_depot_tools,CoherentLabs/depot_tools,duanwujie/depot_tools,aleonliao/depot_tools